Improvement in oil-well pumps



UNITED STATES Artnr trice..

Jenn n. noo'r, or new YORK, N. Y.

lMPR-OVEMENT lN OIL-WELL PUMPS.

specification foi-ming pm or Letters Patent No. 47,1133, uma Api-i1 4, isnt.

-r representinga vertical section of a well tubed and having pumps applied according to my invention.

-The gases which are formed in petroleumwells interfere very seriously with the pumping' up of the oil when the wells are tubed in the usual manner with a single tube. This is owing to there being no other outlet for the gases but through the oil-pump, which constantly works en theihexpansionwith its valves continually open, and so fails entirely to bring up oil, or bring up very little, though here is a copious supply in the well, The object ot' this invention is to obviate this interference of the gases with the working of the oil-pump; and to this end it consists in providing in an oil-well, besides the ordinary oil-tube connected with the oil-pump, an additional tube connected 'with an exhaustingpump at the top of the well for ldrawing oft' or permitting the escape of gases. It also consists 1u a certain mode, hereinafter described, ot' applying such additional tube and the seedbag ,in combination with cach other and with the oil-tube, whereby great facility is ',a'orded for applying the said addi- Y tional tube and for the removal ofthe oil-tube and oil-pump .from the well without disturbing the seed-bag or permitting water to enter the lower part of the well.

'A is the oil-tube, made much smaller than the well, and having the oil-pump B at its lower end, as is usual in the ordinary system of tubing oil-wells.

Gis the additional tube, represented as made of iron, with an internal diameter larger than the external diameter of the oil-tube A. This tube C surrounds the oil-tube, and is attached to the upper end thereof by an air-tight flanged joint, b. Thelength of the said tube C is such that it extends from the upper end of the oiltube to such depth down the bore a c of the Well as it is desirable to place the seed-bag D, which is employed to exclude the water from the lower part of the bore whence the oil is obtained. The seed-bag is supported upon an external lan ge, o, formed upon the open lower end of the said tube C. At or near the mouth of the well, above the ground, there is an ex-' hausting-pump, E, which may be like an ordinary air-pump, the gas-exhaust pipe F of which is eonneetedwith the upper part of the tube G.

TheV exhausting-pump E may be kept at work continually, if' necessary, or so long as gas is being collected or accumulating in the well, which maybe ascertained by a pressuregage attached to the gasexhaust pipe, -or byv such other means as experience may suggest,

lthe gas coming up the tube C to the exhaustpipe F, and by its keeping the well free of gas it leaves nothing for the oil-pump to do but to bring up theoiI. So long .as it-iskeptin .operation it will, it' of sufficient capacity and worked at a proper speed, keep a partial vacuum in the lower part ot' the well and so en-` courage the llow ot' oil to the well through the crevices in' the sides thereof.' Without the pump the tube C might in some cases be used to allow the gas to escape in a natural way.

It is not absolutely necessary to arrange the gas-tube C around the oil-tube, as it might be varranged ou one side thereof ifthe seed-bag be properly applied in connection with the two tubes to exclude water from the lower. part of the well but I consider it best to arrange it around the oil-tube as represented, as so applied it enables the oil tube .and pump to be taken up AWhenever necessary by disconnecting the flange b without disturbing the seed-bag. Even in cases where it is not necessary to exhaust or provide for the escape ot' gas, such a tuhe, C, might be'used in the form and manner represented as a means of enablin g the oil tube and pump to be removed without 'disturbing the seedbag By constructing the .tube G ot' soft wood -and inserting it tightly into the bore it might be made to dispense with the seed-bag, as'it would be swollen byany incoming Wat-er and so made to exclude the waterfrom the lower part of the well.

What I claim as my invention, and desire to secure by Letters Patent, is

l. The employment, in an oil-well, of an additional tube, so arranged and applied, in combination with the oil-tube and anexhaustingpump, that while it permits the exclusion of y waterfrom the lower part Of the well by means substantially as herein described, whereby the 'of themed-bag, itprovides for the escape 0f Oil-tube 21nd/ Oil-pump :may be removed withthe gases from the Well7 substantially as here- Out disturbing the seed-bag.

in described.

2. The arrangement of the tube 0,surr0mul Vitnessesg in g' sind. connected with the upper lpart Of the Oil-tube A, :md applied within The Well,

"JOHN ROOT.

HENRY T. BROWN, J. W. COOMBs. 

